6.7L Cummins Injectors and Fuel Lines – Injector Supply Lines (High Pressure) – Inspect for Reuse

Inspect the high-pressure fuel supply line ferrules for any signs of burrs, or foreign material, rounding, or cracking;
replace if necessary.
Check the fuel supply lines for cracks, wear, or pinched areas. Replace if necessary.
Inspect the ends of the high-pressure lines for damaged sealing surfaces.